I made CW trainer and decoder programs that can handle Hangul (Korean alphabet) as well as English. As far as I know, Hangul CW decoder wasn't made yet by anyone, because it is not possible to complete using just normal Hangul automata logic. I borrowed hangul processing library but I had to changed a lot. With the decoder, you can decode CW QSO, even when its speed is very fast.
Decoder needs to record sound with a mic. So I recommend you to use laptop or tablet or smartphone. In the core logic, decoder calculate SNR(signal-to-noise ratio) of recorded sound to decide whether it is dit/dah or gap. But sometimes noise disturbs the analysing process. So, 1) find some strong signal, 2) decrease the RF gain, and 3) increase the AF gain. It helps a lot.
Additionally, with the decoder, you can test your CW keying correctness. If you have a computer-to-key interface, it is very useful.
And the trainer program is also very helpful when exercising CW listening. As you know, listening is more difficult and important than keying in CW world.
Hangul CW Decoder - shingiru.githu...
Hangul CW Trainer - shingiru.githu...
Негізгі бет High Speed (50 WPM) Hangul CW Decoding
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